What is Carbon Capture and Storage (CCS)?

What Is Carbon Capture and Storage (CCS)? A Guide for Carbon Market Professionals

As pressure mounts on heavy industry to cut emissions, one technology keeps coming up in climate finance conversations: carbon capture and storage, or CCS. Unlike nature-based solutions that rely on trees or soil, CCS is an engineered approach, and it's increasingly relevant to how hard-to-abate sectors plan their path to net-zero.

For anyone working in carbon markets, emissions management, or climate finance, CCS is worth understanding on its own terms. It's technically different from other carbon removal and reduction methods, it plays a distinct role in industrial decarbonization, and it's shaping how certain carbon credits get generated and priced.

This article breaks down what CCS actually is, how it works, and why it matters to carbon markets specifically.

What Is Carbon Capture and Storage, Exactly?

Carbon capture and storage is a process that captures carbon dioxide emissions at the source, typically from power plants, cement factories, or other industrial facilities, before they reach the atmosphere. That captured CO₂ is then transported, usually by pipeline, and injected deep underground into geological formations for long-term storage.

The key distinction here is that CCS targets point-source emissions. It's fitted directly onto a facility that's already emitting CO₂, capturing it before it escapes, rather than pulling carbon out of the open atmosphere afterward. That's different from direct air capture (DAC), which extracts CO₂ from ambient air regardless of where it originally came from. Both fall under the broader umbrella of carbon capture technologies, but they serve different purposes and are typically evaluated separately in carbon markets.

How CCS Actually Works

The CCS process generally involves three stages:

• Capture: CO₂ is separated from other gases at the emission source, using chemical solvents, membranes, or other separation technologies.
• Transport: The captured CO₂ is compressed and transported, usually via pipeline, to a suitable storage site.
• Storage: The CO₂ is injected deep underground into geological formations, such as depleted oil and gas reservoirs or deep saline aquifers, where it's meant to remain permanently trapped.

Some CCS projects also incorporate a fourth step, utilisation, where captured CO₂ is used to make products like synthetic fuels or building materials, sometimes referred to as CCUS (carbon capture, utilisation, and storage).

Why CCS Matters for Industrial Decarbonization

CCS plays a particularly important role in sectors where emissions are difficult to eliminate through electrification or renewable energy alone. Cement production, steelmaking, and certain chemical processes release CO₂ as a direct result of the chemical reactions involved, not just from energy use. That means switching to renewable power doesn't fully solve the emissions problem for these industries.

This is where CCS becomes essential rather than optional. It allows heavy industry to keep operating while significantly cutting the emissions that would otherwise be unavoidable. For companies mapping out a full decarbonization pathway, this step-by-step guide to building a carbon reduction strategy is a useful reference for understanding how technologies like CCS fit alongside broader emissions reduction efforts, rather than replacing them.

CCS and Carbon Credits

CCS projects can generate carbon credits when they demonstrate verified, additional emissions reductions, meaning the captured CO₂ wouldn't have been prevented without the project. These credits are increasingly listed under recognised methodologies from standards bodies like Verra and Gold Standard, alongside more established categories like renewable energy and forestry.

If you're new to how these credits move from project to buyer, this guide on how carbon trading works explains the fundamentals of credit issuance, listing, and trading.

Because CCS is capital-intensive and technically complex, credits from these projects often carry different risk and pricing profiles compared to nature-based credits. Verification tends to focus heavily on measuring actual injected and stored volumes, along with monitoring for leakage over time, rather than the kind of ecological indicators used in forestry or blue carbon projects.

Sourcing CCS-Linked Carbon Credits

For companies looking to include CCS-based credits in an offset portfolio, sourcing through a reliable carbon offset platform makes it easier to review project documentation, storage verification, and certification standards before purchasing. Given how technical CCS projects can be, that due diligence step matters more here than with many other credit categories.

Buyers comparing CCS credits against other project types, renewable energy, methane capture, or nature-based removal, often use a carbon trading platform to evaluate options side by side, weighing factors like permanence, cost, and co-benefits before deciding where to allocate offset budgets.

Pricing and Market Trends

CCS credits have historically traded at a premium compared to many nature-based categories, largely due to high project costs and strong permanence, once CO₂ is securely stored underground, the risk of reversal is generally very low compared to forestry-based approaches.

Teams tracking how CCS pricing compares across project types can benefit from carbon market intelligence tools that surface pricing data across categories. Access to real time global carbon credit pricing is especially useful here, since CCS remains a smaller, less liquid segment of the market compared to renewable energy credits, making up-to-date pricing data more valuable for informed purchasing decisions.

CCS vs. Other Carbon Removal Methods

It's worth being clear about where CCS fits relative to other approaches gaining attention in carbon markets:

• CCS vs. Direct Air Capture (DAC): CCS captures emissions at an industrial source; DAC pulls CO₂ from ambient air anywhere, making it a true removal technology rather than an emissions-reduction one.
• CCS vs. Biochar: Biochar stabilises carbon from biomass into a solid, soil-applied material; CCS captures gaseous CO₂ and stores it underground, an entirely different mechanism and cost structure.
• CCS vs. Nature-based removal: Forestry and blue carbon projects sequester carbon biologically over time; CCS captures emissions immediately at the source, with storage that doesn't depend on ecosystem health.

Understanding these distinctions matters when building a diversified offset or removal portfolio, since each method carries different cost, permanence, and risk characteristics.

Challenges Facing CCS

CCS isn't without hurdles. Capital costs remain high, and building out pipeline and storage infrastructure takes significant time and investment. There are also legitimate questions in the market about how CCS should be used, some critics argue it risks extending the life of fossil fuel infrastructure rather than accelerating a genuine transition away from it, particularly when applied to power generation rather than hard-to-abate industrial processes.

That said, for sectors like cement and steel, where few alternatives currently exist, CCS remains one of the most credible tools available for meaningful emissions reduction at scale.

The Bottom Line

Carbon capture and storage occupies a distinct and increasingly important place in the climate finance landscape. It won't replace nature-based solutions or renewable energy, but for hard-to-abate industries, it offers a genuine pathway to significant emissions reduction. As the technology matures and costs come down, CCS is likely to play a growing role in both compliance and voluntary carbon markets.

For anyone building a carbon strategy or evaluating credit sourcing options, understanding how CCS fits alongside other reduction and removal methods is an increasingly essential part of the picture.